FF : Custom URLs for external apps in settings

[Mat]

I'm struggling with the mailto option in Firefox. I was able to setup gmail as the default option, but I'm using multiple accounts and I need one to remain the default (#0) for my file in gdrive, and the other one to be used for emails (#1)

So far, I didn't find a way to make FF open the mailto with my #1 gmail account. That would mean a lot to me to streamline my actions when using FF.

[Jon]

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